package com.atguigu.gulimail.ware.service.impl;

import com.alibaba.fastjson.TypeReference;
import com.atguigu.common.exception.NoStockException;
import com.atguigu.common.to.SkuHasStockVo;
import com.atguigu.common.to.mq.OrderTo;
import com.atguigu.common.to.mq.StockDetailTo;
import com.atguigu.common.to.mq.StockLockedTo;
import com.atguigu.common.utils.PageUtils;
import com.atguigu.common.utils.Query;
import com.atguigu.common.utils.R;
import com.atguigu.gulimail.ware.dao.WareSkuDao;
import com.atguigu.gulimail.ware.entity.WareOrderTaskDetailEntity;
import com.atguigu.gulimail.ware.entity.WareOrderTaskEntity;
import com.atguigu.gulimail.ware.entity.WareSkuEntity;
import com.atguigu.gulimail.ware.feign.OrderFeignService;
import com.atguigu.gulimail.ware.feign.ProductFeignService;
import com.atguigu.gulimail.ware.service.WareOrderTaskDetailService;
import com.atguigu.gulimail.ware.service.WareOrderTaskService;
import com.atguigu.gulimail.ware.service.WareSkuService;
import com.atguigu.gulimail.ware.vo.OrderItemVo;
import com.atguigu.gulimail.ware.vo.OrderVo;
import com.atguigu.gulimail.ware.vo.WareSkuLockVo;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import lombok.Data;
import org.apache.commons.lang.StringUtils;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

@Service("wareSkuService")
public class WareSkuServiceImpl extends ServiceImpl<WareSkuDao, WareSkuEntity> implements WareSkuService {

    @Autowired
    private ProductFeignService productFeignService;

    @Autowired
    private WareSkuDao wareSkuDao;

    @Autowired
    private RabbitTemplate rabbitTemplate;

    @Autowired
    private WareOrderTaskService orderTaskService;

    @Autowired
    private WareOrderTaskDetailService taskDetailService;

    @Autowired
    private OrderFeignService orderFeignService;

    @Override
    public void unlockStock(StockLockedTo to) {
        StockDetailTo detail = to.getDetailTo();
        Long detailId = detail.getId();
        // 解锁
        // 查询数据库关于这个订单的锁定库存信息
        // 有 证明库存锁定成功了
        //   解锁：订单情况
        //      1、没有这个订单 必须解锁
        //      2、有这个订单
        //           订单状态 已取消：解锁库存
        //                  没取消：不能库存
        // 没有 库存锁定失败 库存回滚 这种情况无需解锁
        WareOrderTaskDetailEntity byId = taskDetailService.getById(detailId);
        if (byId != null) {
            // 解锁
            Long id = to.getId(); // 库存工作单的id
            WareOrderTaskEntity taskEntity = orderTaskService.getById(id);
            String orderSn = taskEntity.getOrderSn(); // 根据订单号查询订单状态
            R r = orderFeignService.getOrderStatus(orderSn);
            if (r.getCode() == 0) {
                // 订单数据返回成功
                OrderVo data = r.getData(new TypeReference<OrderVo>() {
                });
                if (data == null || data.getStatus() == 4) {
                    // 订单不存在 或者订单被取消 才能解锁库存
                    if (byId.getLockStatus() == 1) {
                        // 当前库存工作单详情 状态1 已锁定但是未解锁才可以解锁
                        unLockStock(detail.getSkuId(), detail.getWareId(), detail.getSkuNum(), detailId);
                    }
                }
            } else {
                // 消息拒绝以后重新放到队列里面 让别人继续消费解锁
                throw new RuntimeException("远程服务失败");
            }
        } else {
            // 无需解锁
        }
    }

    @Transactional
    @Override
    public void unlockStock(OrderTo orderTo) {
        String orderSn = orderTo.getOrderSn();
        WareOrderTaskEntity task = orderTaskService.getOrderTaskByOrderSn(orderSn);
        Long id = task.getId();
        List<WareOrderTaskDetailEntity> entities = taskDetailService.list(new QueryWrapper<WareOrderTaskDetailEntity>()
                .eq("task_id", id)
                .eq("lock_status", 1));
        for (WareOrderTaskDetailEntity entity : entities) {
            unLockStock(entity.getSkuId(), entity.getWareId(), entity.getSkuNum(), entity.getId());
        }
    }

    private void unLockStock(Long skuId, Long wareId, Integer skuNum, Long detailId) {
        // 库存解锁
        wareSkuDao.unlockStock(skuId, wareId, skuNum);
        // 更新库存工作单的状态
        WareOrderTaskDetailEntity entity = new WareOrderTaskDetailEntity();
        entity.setId(detailId);
        entity.setLockStatus(2); // 变为已解锁
        taskDetailService.updateById(entity);

    }

    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        QueryWrapper<WareSkuEntity> queryWrapper = new QueryWrapper<>();

        String skuId = (String) params.get("skuId");
        if (!StringUtils.isEmpty(skuId)) {
            queryWrapper.eq("sku_id", skuId);
        }

        String wareId = (String) params.get("wareId");
        if (!StringUtils.isEmpty(wareId)) {
            queryWrapper.eq("ware_id", wareId);
        }

        IPage<WareSkuEntity> page = this.page(
                new Query<WareSkuEntity>().getPage(params),
                queryWrapper
        );

        return new PageUtils(page);
    }

    @Transactional
    @Override
    public void addStock(Long skuId, Long wareId, Integer skuNum) {
        List<WareSkuEntity> wareSkuEntities = wareSkuDao.selectList(new QueryWrapper<WareSkuEntity>().eq("sku_id", skuId).eq("ware_id", wareId));
        if (wareSkuEntities == null || wareSkuEntities.size() == 0) {
            WareSkuEntity wareSkuEntity = new WareSkuEntity();
            wareSkuEntity.setSkuId(skuId);
            wareSkuEntity.setWareId(wareId);
            wareSkuEntity.setStock(skuNum);
            wareSkuEntity.setStockLocked(0);

            try {
                R info = productFeignService.info(skuId);
                Map<String, Object> data = (Map<String, Object>) info.get("skuInfo");

                if (info.getCode() == 0) {
                    wareSkuEntity.setSkuName((String) data.get("skuName"));
                }
            } catch (Exception e) {

            }

            wareSkuDao.insert(wareSkuEntity);
        } else {
            wareSkuDao.addStock(skuId, wareId, skuNum);
        }
    }

    @Override
    public List<SkuHasStockVo> getSkusHasStock(List<Long> skuIds) {
        return skuIds.stream().map(skuId -> {
            SkuHasStockVo stockVo = new SkuHasStockVo();
            Long count = baseMapper.getSkuStock(skuId);
            stockVo.setSkuId(skuId);
            stockVo.setHasStock(count != null && count > 0);
            return stockVo;
        }).collect(Collectors.toList());
    }

    /**
     * 为某个订单锁定库存
     * <p>
     * (rollbackFor = NoStockException.class)
     * 默认只要是运行时异常都会回滚
     *
     * @param vo
     * @return 库存解锁的场景
     * 1）下订单成功 订单过期没有支付|被系统自动取消 被用户手动取消
     * 2) 下订单成功 库存锁定成功 但接下来的业务调用失败 导致订单回滚
     * 之前锁定的库存就要自动解锁
     */
    @Transactional
    @Override
    public Boolean orderLockStock(WareSkuLockVo vo) {
        /**
         * 保存库存工作单的详情
         * 追溯
         */
        WareOrderTaskEntity taskEntity = new WareOrderTaskEntity();
        taskEntity.setOrderSn(vo.getOrderSn());
        orderTaskService.save(taskEntity);

        // 按照下单的收货地址 找到一个就近仓库 锁定库存
        // 找到每个商品在哪个仓库都有库存
        List<OrderItemVo> locks = vo.getLocks();
        List<SkuWareHasStock> collect = locks.stream().map(lock -> {
            SkuWareHasStock stock = new SkuWareHasStock();
            Long skuId = lock.getSkuId();
            stock.setSkuId(skuId);
            stock.setNum(lock.getCount());
            // 查询这个商品在哪里有库存
            List<Long> wareIds = wareSkuDao.listWareIdHasSkuStock(skuId);
            stock.setWareId(wareIds);
            return stock;
        }).collect(Collectors.toList());

        // 锁定库存
        for (SkuWareHasStock hasStock : collect) {
            boolean skuStocked = false;
            Long skuId = hasStock.getSkuId();
            List<Long> wareIds = hasStock.getWareId();
            if (wareIds == null || wareIds.size() == 0) {
                throw new NoStockException(skuId);
            }
            for (Long wareId : wareIds) {
                // 成功就返回1，否则就是0
                Long count = wareSkuDao.lockSkuStock(skuId, wareId, hasStock.getNum());
                if (count == 1) {
                    skuStocked = true;
                    // TODO 告诉MQ库存锁定成功
                    WareOrderTaskDetailEntity entity = new WareOrderTaskDetailEntity(null,
                            skuId, null, hasStock.getNum(), taskEntity.getId(), wareId, 1);
                    taskDetailService.save(entity);
                    // (String exchange, String routingKey, Object message,
                    // MessagePostProcessor messagePostProcessor,CorrelationData correlationData)
                    StockLockedTo lockedTo = new StockLockedTo();
                    lockedTo.setId(taskEntity.getId());
                    StockDetailTo detailTo = new StockDetailTo();
                    BeanUtils.copyProperties(entity, detailTo);
                    lockedTo.setDetailTo(detailTo);
                    rabbitTemplate.convertAndSend("stock-event-exchange", "stock.locked", lockedTo);
                    break;
                } else {
                    // 当前仓库锁失败 重试下一个仓库
                }
            }
            // 当前商品所有仓库都没有锁住
            if (!skuStocked) {
                throw new NoStockException(skuId);
            }
        }

        // 全部锁定成功
        return true;
    }

    @Data
    class SkuWareHasStock {
        private Long skuId;
        private Integer num;
        private List<Long> wareId;
    }

}